Ballast block



FIG. 1 is a front, top and right side perspective view of a ballast block, showing the new design;

FIG. 2 is a front, bottom and left side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown in the Figures are included to show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a ballast block, as shown and described. 